MeasureThat.net

Run results for: Object spread vs New map entries

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.81 Safari/537.36
Chrome 104
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
Obj spread 1738.0 Ops/sec
new Map 75.6 Ops/sec
Script Preparation code:
AخA
 
var data = new Array(100000).fill(undefined).map((_,i) => i)
var obj = data.reduce((obj, idx) => {obj[idx] = idx; return obj}, {});
var map = new Map(Object.entries(obj));
Tests:

  • Obj spread

     
    let a = {...obj};

  • new Map

     
    let a = new Map([...map.entries()]);